Merge tag 'crc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux

e2fffe1d · Linus Torvalds <[email protected]> · 2025-09-29 15:36:42 -07:00

Pull CRC updates from Eric Biggers:
 "Update crc_kunit to test the CRC functions in softirq and hardirq
  contexts, similar to what the lib/crypto/ KUnit tests do. Move the
  helper function needed to do this into a common header.

  This is useful mainly to test fallback code paths for when
  FPU/SIMD/vector registers are unusable"

* tag 'crc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux:
  Documentation/staging: Fix typo and incorrect citation in crc32.rst
  lib/crc: Drop inline from all *_mod_init_arch() functions
  lib/crc: Use underlying functions instead of crypto_simd_usable()
  lib/crc: crc_kunit: Test CRC computation in interrupt contexts
  kunit, lib/crypto: Move run_irq_test() to common header

Commit: e2fffe1d958b3660bc4e07e6542d97b6cc168826
Parents: d60ac92c · 136d0296

Merge commit. Changes below are compared with the first parent: d60ac92c.

Changes

17 files changed · +219 −165

File	Status	Add	Del	Content
Documentation/staging/crc32.rst	modified	+2	−2	View file
include/kunit/run-in-irq-context.h	added	+129	−0	View file
lib/crc/arm/crc-t10dif.h	modified	+3	−5	View file
lib/crc/arm/crc32.h	modified	+3	−5	View file
lib/crc/arm64/crc-t10dif.h	modified	+3	−5	View file
lib/crc/arm64/crc32.h	modified	+6	−5	View file
lib/crc/loongarch/crc32.h	modified	+1	−1	View file
lib/crc/mips/crc32.h	modified	+1	−1	View file
lib/crc/powerpc/crc-t10dif.h	modified	+4	−3	View file
lib/crc/powerpc/crc32.h	modified	+4	−3	View file
lib/crc/sparc/crc32.h	modified	+1	−1	View file
lib/crc/tests/crc_kunit.c	modified	+53	−9	View file
lib/crc/x86/crc-pclmul-template.h	modified	+1	−2	View file
lib/crc/x86/crc-t10dif.h	modified	+1	−1	View file
lib/crc/x86/crc32.h	modified	+2	−2	View file
lib/crc/x86/crc64.h	modified	+1	−1	View file
lib/crypto/tests/hash-test-template.h	modified	+4	−119	View file

Only the first 600 diff lines are shown. Download the complete patch.

Documentation/staging/crc32.rst

View file

diff --git a/Documentation/staging/crc32.rst b/Documentation/staging/crc32.rst
index 7542220..64f3dd4 100644
--- a/Documentation/staging/crc32.rst
+++ b/Documentation/staging/crc32.rst
@@ -34,7 +34,7 @@ do it in the right order, matching the endianness.
 Just like with ordinary division, you proceed one digit (bit) at a time.
 Each step of the division you take one more digit (bit) of the dividend
 and append it to the current remainder.  Then you figure out the
-appropriate multiple of the divisor to subtract to being the remainder
+appropriate multiple of the divisor to subtract to bring the remainder
 back into range.  In binary, this is easy - it has to be either 0 or 1,
 and to make the XOR cancel, it's just a copy of bit 32 of the remainder.
 
@@ -116,7 +116,7 @@ for any fractional bytes at the end.
 To reduce the number of conditional branches, software commonly uses
 the byte-at-a-time table method, popularized by Dilip V. Sarwate,
 "Computation of Cyclic Redundancy Checks via Table Look-Up", Comm. ACM
-v.31 no.8 (August 1998) p. 1008-1013.
+v.31 no.8 (August 1988) p. 1008-1013.
 
 Here, rather than just shifting one bit of the remainder to decide
 in the correct multiple to subtract, we can shift a byte at a time.

include/kunit/run-in-irq-context.h

View file

diff --git a/include/kunit/run-in-irq-context.h b/include/kunit/run-in-irq-context.h
new file mode 100644
index 0000000..108e964
--- /dev/null
+++ b/include/kunit/run-in-irq-context.h
@@ -0,0 +1,129 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Helper function for testing code in interrupt contexts
+ *
+ * Copyright 2025 Google LLC
+ */
+#ifndef _KUNIT_RUN_IN_IRQ_CONTEXT_H
+#define _KUNIT_RUN_IN_IRQ_CONTEXT_H
+
+#include <kunit/test.h>
+#include <linux/timekeeping.h>
+#include <linux/hrtimer.h>
+#include <linux/workqueue.h>
+
+#define KUNIT_IRQ_TEST_HRTIMER_INTERVAL us_to_ktime(5)
+
+struct kunit_irq_test_state {
+	bool (*func)(void *test_specific_state);
+	void *test_specific_state;
+	bool task_func_reported_failure;
+	bool hardirq_func_reported_failure;
+	bool softirq_func_reported_failure;
+	unsigned long hardirq_func_calls;
+	unsigned long softirq_func_calls;
+	struct hrtimer timer;
+	struct work_struct bh_work;
+};
+
+static enum hrtimer_restart kunit_irq_test_timer_func(struct hrtimer *timer)
+{
+	struct kunit_irq_test_state *state =
+		container_of(timer, typeof(*state), timer);
+
+	WARN_ON_ONCE(!in_hardirq());
+	state->hardirq_func_calls++;
+
+	if (!state->func(state->test_specific_state))
+		state->hardirq_func_reported_failure = true;
+
+	hrtimer_forward_now(&state->timer, KUNIT_IRQ_TEST_HRTIMER_INTERVAL);
+	queue_work(system_bh_wq, &state->bh_work);
+	return HRTIMER_RESTART;
+}
+
+static void kunit_irq_test_bh_work_func(struct work_struct *work)
+{
+	struct kunit_irq_test_state *state =
+		container_of(work, typeof(*state), bh_work);
+
+	WARN_ON_ONCE(!in_serving_softirq());
+	state->softirq_func_calls++;
+
+	if (!state->func(state->test_specific_state))
+		state->softirq_func_reported_failure = true;
+}
+
+/*
+ * Helper function which repeatedly runs the given @func in task, softirq, and
+ * hardirq context concurrently, and reports a failure to KUnit if any
+ * invocation of @func in any context returns false.  @func is passed
+ * @test_specific_state as its argument.  At most 3 invocations of @func will
+ * run concurrently: one in each of task, softirq, and hardirq context.
+ *
+ * The main purpose of this interrupt context testing is to validate fallback
+ * code paths that run in contexts where the normal code path cannot be used,
+ * typically due to the FPU or vector registers already being in-use in kernel
+ * mode.  These code paths aren't covered when the test code is executed only by
+ * the KUnit test runner thread in task context.  The reason for the concurrency
+ * is because merely using hardirq context is not sufficient to reach a fallback
+ * code path on some architectures; the hardirq actually has to occur while the
+ * FPU or vector unit was already in-use in kernel mode.
+ *
+ * Another purpose of this testing is to detect issues with the architecture's
+ * irq_fpu_usable() and kernel_fpu_begin/end() or equivalent functions,
+ * especially in softirq context when the softirq may have interrupted a task
+ * already using kernel-mode FPU or vector (if the arch didn't prevent that).
+ * Crypto functions are often executed in softirqs, so this is important.
+ */
+static inline void kunit_run_irq_test(struct kunit *test, bool (*func)(void *),
+				      int max_iterations,
+				      void *test_specific_state)
+{
+	struct kunit_irq_test_state state = {
+		.func = func,
+		.test_specific_state = test_specific_state,
+	};
+	unsigned long end_jiffies;
+
+	/*
+	 * Set up a hrtimer (the way we access hardirq context) and a work
+	 * struct for the BH workqueue (the way we access softirq context).
+	 */
+	hrtimer_setup_on_stack(&state.timer, kunit_irq_test_timer_func,
+			       CLOCK_MONOTONIC, HRTIMER_MODE_REL_HARD);
+	INIT_WORK_ONSTACK(&state.bh_work, kunit_irq_test_bh_work_func);
+
+	/* Run for up to max_iterations or 1 second, whichever comes first. */
+	end_jiffies = jiffies + HZ;
+	hrtimer_start(&state.timer, KUNIT_IRQ_TEST_HRTIMER_INTERVAL,
+		      HRTIMER_MODE_REL_HARD);
+	for (int i = 0; i < max_iterations && !time_after(jiffies, end_jiffies);
+	     i++) {
+		if (!func(test_specific_state))
+			state.task_func_reported_failure = true;
+	}
+
+	/* Cancel the timer and work. */
+	hrtimer_cancel(&state.timer);
+	flush_work(&state.bh_work);
+
+	/* Sanity check: the timer and BH functions should have been run. */
+	KUNIT_EXPECT_GT_MSG(test, state.hardirq_func_calls, 0,
+			    "Timer function was not called");
+	KUNIT_EXPECT_GT_MSG(test, state.softirq_func_calls, 0,
+			    "BH work function was not called");
+
+	/* Check for incorrect hash values reported from any context. */
+	KUNIT_EXPECT_FALSE_MSG(
+		test, state.task_func_reported_failure,
+		"Incorrect hash values reported from task context");
+	KUNIT_EXPECT_FALSE_MSG(
+		test, state.hardirq_func_reported_failure,
+		"Incorrect hash values reported from hardirq context");
+	KUNIT_EXPECT_FALSE_MSG(
+		test, state.softirq_func_reported_failure,
+		"Incorrect hash values reported from softirq context");
+}
+
+#endif /* _KUNIT_RUN_IN_IRQ_CONTEXT_H */

lib/crc/arm/crc-t10dif.h

View file

diff --git a/lib/crc/arm/crc-t10dif.h b/lib/crc/arm/crc-t10dif.h
index 2edf7e9..63441de 100644
--- a/lib/crc/arm/crc-t10dif.h
+++ b/lib/crc/arm/crc-t10dif.h
@@ -5,8 +5,6 @@
  * Copyright (C) 2016 Linaro Ltd <[email protected]>
  */
 
-#include <crypto/internal/simd.h>
-
 #include <asm/neon.h>
 #include <asm/simd.h>
 
@@ -23,7 +21,7 @@ static inline u16 crc_t10dif_arch(u16 crc, const u8 *data, size_t length)
 {
 	if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE) {
 		if (static_branch_likely(&have_pmull)) {
-			if (crypto_simd_usable()) {
+			if (likely(may_use_simd())) {
 				kernel_neon_begin();
 				crc = crc_t10dif_pmull64(crc, data, length);
 				kernel_neon_end();
@@ -31,7 +29,7 @@ static inline u16 crc_t10dif_arch(u16 crc, const u8 *data, size_t length)
 			}
 		} else if (length > CRC_T10DIF_PMULL_CHUNK_SIZE &&
 			   static_branch_likely(&have_neon) &&
-			   crypto_simd_usable()) {
+			   likely(may_use_simd())) {
 			u8 buf[16] __aligned(16);
 
 			kernel_neon_begin();
@@ -45,7 +43,7 @@ static inline u16 crc_t10dif_arch(u16 crc, const u8 *data, size_t length)
 }
 
 #define crc_t10dif_mod_init_arch crc_t10dif_mod_init_arch
-static inline void crc_t10dif_mod_init_arch(void)
+static void crc_t10dif_mod_init_arch(void)
 {
 	if (elf_hwcap & HWCAP_NEON) {
 		static_branch_enable(&have_neon);

lib/crc/arm/crc32.h

View file

diff --git a/lib/crc/arm/crc32.h b/lib/crc/arm/crc32.h
index 018007e..7b76f52 100644
--- a/lib/crc/arm/crc32.h
+++ b/lib/crc/arm/crc32.h
@@ -7,8 +7,6 @@
 
 #include <linux/cpufeature.h>
 
-#include <crypto/internal/simd.h>
-
 #include <asm/hwcap.h>
 #include <asm/neon.h>
 #include <asm/simd.h>
@@ -34,7 +32,7 @@ static inline u32 crc32_le_scalar(u32 crc, const u8 *p, size_t len)
 static inline u32 crc32_le_arch(u32 crc, const u8 *p, size_t len)
 {
 	if (len >= PMULL_MIN_LEN + 15 &&
-	    static_branch_likely(&have_pmull) && crypto_simd_usable()) {
+	    static_branch_likely(&have_pmull) && likely(may_use_simd())) {
 		size_t n = -(uintptr_t)p & 15;
 
 		/* align p to 16-byte boundary */
@@ -63,7 +61,7 @@ static inline u32 crc32c_scalar(u32 crc, const u8 *p, size_t len)
 static inline u32 crc32c_arch(u32 crc, const u8 *p, size_t len)
 {
 	if (len >= PMULL_MIN_LEN + 15 &&
-	    static_branch_likely(&have_pmull) && crypto_simd_usable()) {
+	    static_branch_likely(&have_pmull) && likely(may_use_simd())) {
 		size_t n = -(uintptr_t)p & 15;
 
 		/* align p to 16-byte boundary */
@@ -85,7 +83,7 @@ static inline u32 crc32c_arch(u32 crc, const u8 *p, size_t len)
 #define crc32_be_arch crc32_be_base /* not implemented on this arch */
 
 #define crc32_mod_init_arch crc32_mod_init_arch
-static inline void crc32_mod_init_arch(void)
+static void crc32_mod_init_arch(void)
 {
 	if (elf_hwcap2 & HWCAP2_CRC32)
 		static_branch_enable(&have_crc32);

lib/crc/arm64/crc-t10dif.h

View file

diff --git a/lib/crc/arm64/crc-t10dif.h b/lib/crc/arm64/crc-t10dif.h
index c4521a7..f88db29 100644
--- a/lib/crc/arm64/crc-t10dif.h
+++ b/lib/crc/arm64/crc-t10dif.h
@@ -7,8 +7,6 @@
 
 #include <linux/cpufeature.h>
 
-#include <crypto/internal/simd.h>
-
 #include <asm/neon.h>
 #include <asm/simd.h>
 
@@ -25,7 +23,7 @@ static inline u16 crc_t10dif_arch(u16 crc, const u8 *data, size_t length)
 {
 	if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE) {
 		if (static_branch_likely(&have_pmull)) {
-			if (crypto_simd_usable()) {
+			if (likely(may_use_simd())) {
 				kernel_neon_begin();
 				crc = crc_t10dif_pmull_p64(crc, data, length);
 				kernel_neon_end();
@@ -33,7 +31,7 @@ static inline u16 crc_t10dif_arch(u16 crc, const u8 *data, size_t length)
 			}
 		} else if (length > CRC_T10DIF_PMULL_CHUNK_SIZE &&
 			   static_branch_likely(&have_asimd) &&
-			   crypto_simd_usable()) {
+			   likely(may_use_simd())) {
 			u8 buf[16];
 
 			kernel_neon_begin();
@@ -47,7 +45,7 @@ static inline u16 crc_t10dif_arch(u16 crc, const u8 *data, size_t length)
 }
 
 #define crc_t10dif_mod_init_arch crc_t10dif_mod_init_arch
-static inline void crc_t10dif_mod_init_arch(void)
+static void crc_t10dif_mod_init_arch(void)
 {
 	if (cpu_have_named_feature(ASIMD)) {
 		static_branch_enable(&have_asimd);

lib/crc/arm64/crc32.h

View file

diff --git a/lib/crc/arm64/crc32.h b/lib/crc/arm64/crc32.h
index 6e5dec4..31e649c 100644
--- a/lib/crc/arm64/crc32.h
+++ b/lib/crc/arm64/crc32.h
@@ -5,8 +5,6 @@
 #include <asm/neon.h>
 #include <asm/simd.h>
 
-#include <crypto/internal/simd.h>
-
 // The minimum input length to consider the 4-way interleaved code path
 static const size_t min_len = 1024;
 
@@ -23,7 +21,8 @@ static inline u32 crc32_le_arch(u32 crc, const u8 *p, size_t len)
 	if (!alternative_has_cap_likely(ARM64_HAS_CRC32))
 		return crc32_le_base(crc, p, len);
 
-	if (len >= min_len && cpu_have_named_feature(PMULL) && crypto_simd_usable()) {
+	if (len >= min_len && cpu_have_named_feature(PMULL) &&
+	    likely(may_use_simd())) {
 		kernel_neon_begin();
 		crc = crc32_le_arm64_4way(crc, p, len);
 		kernel_neon_end();
@@ -43,7 +42,8 @@ static inline u32 crc32c_arch(u32 crc, const u8 *p, size_t len)
 	if (!alternative_has_cap_likely(ARM64_HAS_CRC32))
 		return crc32c_base(crc, p, len);
 
-	if (len >= min_len && cpu_have_named_feature(PMULL) && crypto_simd_usable()) {
+	if (len >= min_len && cpu_have_named_feature(PMULL) &&
+	    likely(may_use_simd())) {
 		kernel_neon_begin();
 		crc = crc32c_le_arm64_4way(crc, p, len);
 		kernel_neon_end();
@@ -63,7 +63,8 @@ static inline u32 crc32_be_arch(u32 crc, const u8 *p, size_t len)
 	if (!alternative_has_cap_likely(ARM64_HAS_CRC32))
 		return crc32_be_base(crc, p, len);
 
-	if (len >= min_len && cpu_have_named_feature(PMULL) && crypto_simd_usable()) {
+	if (len >= min_len && cpu_have_named_feature(PMULL) &&
+	    likely(may_use_simd())) {
 		kernel_neon_begin();
 		crc = crc32_be_arm64_4way(crc, p, len);
 		kernel_neon_end();

lib/crc/loongarch/crc32.h

View file

diff --git a/lib/crc/loongarch/crc32.h b/lib/crc/loongarch/crc32.h
index 6de5c96..d34fa4c 100644
--- a/lib/crc/loongarch/crc32.h
+++ b/lib/crc/loongarch/crc32.h
@@ -101,7 +101,7 @@ static inline u32 crc32c_arch(u32 crc, const u8 *p, size_t len)
 #define crc32_be_arch crc32_be_base /* not implemented on this arch */
 
 #define crc32_mod_init_arch crc32_mod_init_arch
-static inline void crc32_mod_init_arch(void)
+static void crc32_mod_init_arch(void)
 {
 	if (cpu_has_crc32)
 		static_branch_enable(&have_crc32);

lib/crc/mips/crc32.h

View file

diff --git a/lib/crc/mips/crc32.h b/lib/crc/mips/crc32.h
index 11cb272..3100354 100644
--- a/lib/crc/mips/crc32.h
+++ b/lib/crc/mips/crc32.h
@@ -148,7 +148,7 @@ static inline u32 crc32c_arch(u32 crc, const u8 *p, size_t len)
 #define crc32_be_arch crc32_be_base /* not implemented on this arch */
 
 #define crc32_mod_init_arch crc32_mod_init_arch
-static inline void crc32_mod_init_arch(void)
+static void crc32_mod_init_arch(void)
 {
 	if (cpu_have_feature(cpu_feature(MIPS_CRC32)))
 		static_branch_enable(&have_crc32);

lib/crc/powerpc/crc-t10dif.h

View file

diff --git a/lib/crc/powerpc/crc-t10dif.h b/lib/crc/powerpc/crc-t10dif.h
index 59e1680..8f4592a 100644
--- a/lib/crc/powerpc/crc-t10dif.h
+++ b/lib/crc/powerpc/crc-t10dif.h
@@ -6,8 +6,8 @@
  * [based on crc32c-vpmsum_glue.c]
  */
 
+#include <asm/simd.h>
 #include <asm/switch_to.h>
-#include <crypto/internal/simd.h>
 #include <linux/cpufeature.h>
 #include <linux/jump_label.h>
 #include <linux/preempt.h>
@@ -29,7 +29,8 @@ static inline u16 crc_t10dif_arch(u16 crci, const u8 *p, size_t len)
 	u32 crc = crci;
 
 	if (len < (VECTOR_BREAKPOINT + VMX_ALIGN) ||
-	    !static_branch_likely(&have_vec_crypto) || !crypto_simd_usable())
+	    !static_branch_likely(&have_vec_crypto) ||
+	    unlikely(!may_use_simd()))
 		return crc_t10dif_generic(crc, p, len);
 
 	if ((unsigned long)p & VMX_ALIGN_MASK) {
@@ -61,7 +62,7 @@ static inline u16 crc_t10dif_arch(u16 crci, const u8 *p, size_t len)
 }
 
 #define crc_t10dif_mod_init_arch crc_t10dif_mod_init_arch
-static inline void crc_t10dif_mod_init_arch(void)
+static void crc_t10dif_mod_init_arch(void)
 {
 	if (cpu_has_feature(CPU_FTR_ARCH_207S) &&
 	    (cur_cpu_spec->cpu_user_features2 & PPC_FEATURE2_VEC_CRYPTO))

lib/crc/powerpc/crc32.h

View file

diff --git a/lib/crc/powerpc/crc32.h b/lib/crc/powerpc/crc32.h
index 811cc2e..0c85227 100644
--- a/lib/crc/powerpc/crc32.h
+++ b/lib/crc/powerpc/crc32.h
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
+#include <asm/simd.h>
 #include <asm/switch_to.h>
-#include <crypto/internal/simd.h>
 #include <linux/cpufeature.h>
 #include <linux/jump_label.h>
 #include <linux/preempt.h>
@@ -24,7 +24,8 @@ static inline u32 crc32c_arch(u32 crc, const u8 *p, size_t len)
 	unsigned int tail;
 
 	if (len < (VECTOR_BREAKPOINT + VMX_ALIGN) ||
-	    !static_branch_likely(&have_vec_crypto) || !crypto_simd_usable())
+	    !static_branch_likely(&have_vec_crypto) ||
+	    unlikely(!may_use_simd()))
 		return crc32c_base(crc, p, len);
 
 	if ((unsigned long)p & VMX_ALIGN_MASK) {
@@ -54,7 +55,7 @@ static inline u32 crc32c_arch(u32 crc, const u8 *p, size_t len)
 }
 
 #define crc32_mod_init_arch crc32_mod_init_arch
-static inline void crc32_mod_init_arch(void)
+static void crc32_mod_init_arch(void)
 {
 	if (cpu_has_feature(CPU_FTR_ARCH_207S) &&
 	    (cur_cpu_spec->cpu_user_features2 & PPC_FEATURE2_VEC_CRYPTO))

lib/crc/sparc/crc32.h

View file

diff --git a/lib/crc/sparc/crc32.h b/lib/crc/sparc/crc32.h
index 60f2765..df7c350 100644
--- a/lib/crc/sparc/crc32.h
+++ b/lib/crc/sparc/crc32.h
@@ -44,7 +44,7 @@ static inline u32 crc32c_arch(u32 crc, const u8 *data, size_t len)
 }
 
 #define crc32_mod_init_arch crc32_mod_init_arch
-static inline void crc32_mod_init_arch(void)
+static void crc32_mod_init_arch(void)
 {
 	unsigned long cfr;
 

lib/crc/tests/crc_kunit.c

View file

diff --git a/lib/crc/tests/crc_kunit.c b/lib/crc/tests/crc_kunit.c
index f08d985..9a450e2 100644
--- a/lib/crc/tests/crc_kunit.c
+++ b/lib/crc/tests/crc_kunit.c
@@ -6,6 +6,7 @@
  *
  * Author: Eric Biggers <[email protected]>
  */
+#include <kunit/run-in-irq-context.h>
 #include <kunit/test.h>
 #include <linux/crc7.h>
 #include <linux/crc16.h>
@@ -141,6 +142,54 @@ static size_t generate_random_length(size_t max_length)
 	return len % (max_length + 1);
 }
 
+#define IRQ_TEST_DATA_LEN 512
+#define IRQ_TEST_NUM_BUFFERS 3 /* matches max concurrency level */
+
+struct crc_irq_test_state {
+	const struct crc_variant *v;
+	u64 initial_crc;
+	u64 expected_crcs[IRQ_TEST_NUM_BUFFERS];
+	atomic_t seqno;
+};
+
+/*
+ * Compute the CRC of one of the test messages and verify that it matches the
+ * expected CRC from @state->expected_crcs.  To increase the chance of detecting
+ * problems, cycle through multiple messages.
+ */
+static bool crc_irq_test_func(void *state_)
+{
+	struct crc_irq_test_state *state = state_;
+	const struct crc_variant *v = state->v;
+	u32 i = (u32)atomic_inc_return(&state->seqno) % IRQ_TEST_NUM_BUFFERS;
+	u64 actual_crc = v->func(state->initial_crc,
+				 &test_buffer[i * IRQ_TEST_DATA_LEN],
+				 IRQ_TEST_DATA_LEN);
+
+	return actual_crc == state->expected_crcs[i];
+}
+
+/*
+ * Test that if CRCs are computed in task, softirq, and hardirq context
+ * concurrently, then all results are as expected.
+ */
+static void crc_interrupt_context_test(struct kunit *test,
+				       const struct crc_variant *v)
+{
+	struct crc_irq_test_state state = {
+		.v = v,
+		.initial_crc = generate_random_initial_crc(v),
+	};
+
+	for (int i = 0; i < IRQ_TEST_NUM_BUFFERS; i++) {
+		state.expected_crcs[i] = crc_ref(
+			v, state.initial_crc,
+			&test_buffer[i * IRQ_TEST_DATA_LEN], IRQ_TEST_DATA_LEN);
+	}
+
+	kunit_run_irq_test(test, crc_irq_test_func, 100000, &state);
+}
+
 /* Test that v->func gives the same CRCs as a reference implementation. */
 static void crc_test(struct kunit *test, const struct crc_variant *v)
 {
@@ -149,7 +198,6 @@ static void crc_test(struct kunit *test, const struct crc_variant *v)
 	for (i = 0; i < CRC_KUNIT_NUM_TEST_ITERS; i++) {
 		u64 init_crc, expected_crc, actual_crc;
 		size_t len, offset;
-		bool nosimd;
 
 		init_crc = generate_random_initial_crc(v);
 		len = generate_random_length(CRC_KUNIT_MAX_LEN);
@@ -168,22 +216,18 @@ static void crc_test(struct kunit *test, const struct crc_variant *v)
 			/* Refresh the data occasionally. */
 			prandom_bytes_state(&rng, &test_buffer[offset], len);
 
-		nosimd = rand32() % 8 == 0;
-
 		/*
 		 * Compute the CRC, and verify that it equals the CRC computed
 		 * by a simple bit-at-a-time reference implementation.
 		 */
 		expected_crc = crc_ref(v, init_crc, &test_buffer[offset], len);
-		if (nosimd)
-			local_irq_disable();
 		actual_crc = v->func(init_crc, &test_buffer[offset], len);
-		if (nosimd)
-			local_irq_enable();
 		KUNIT_EXPECT_EQ_MSG(test, expected_crc, actual_crc,
-				    "Wrong result with len=%zu offset=%zu nosimd=%d",
-				    len, offset, nosimd);
+				    "Wrong result with len=%zu offset=%zu",
+				    len, offset);
 	}
+
+	crc_interrupt_context_test(test, v);
 }
 
 static __always_inline void

lib/crc/x86/crc-pclmul-template.h

View file

diff --git a/lib/crc/x86/crc-pclmul-template.h b/lib/crc/x86/crc-pclmul-template.h
index 35c950d..0274483 100644
--- a/lib/crc/x86/crc-pclmul-template.h
+++ b/lib/crc/x86/crc-pclmul-template.h
@@ -12,7 +12,6 @@
 
 #include <asm/cpufeatures.h>
 #include <asm/simd.h>
-#include <crypto/internal/simd.h>
 #include <linux/static_call.h>
 #include "crc-pclmul-consts.h"
 
@@ -57,7 +56,7 @@ static inline bool have_avx512(void)
 #define CRC_PCLMUL(crc, p, len, prefix, consts, have_pclmulqdq)		\
 do {									\
 	if ((len) >= 16 && static_branch_likely(&(have_pclmulqdq)) &&	\
-	    crypto_simd_usable()) {					\
+	    likely(irq_fpu_usable())) {					\
 		const void *consts_ptr;					\
 									\
 		consts_ptr = (consts).fold_across_128_bits_consts;	\

lib/crc/x86/crc-t10dif.h

View file

diff --git a/lib/crc/x86/crc-t10dif.h b/lib/crc/x86/crc-t10dif.h
index 2a02a30..8ee8824 100644
--- a/lib/crc/x86/crc-t10dif.h
+++ b/lib/crc/x86/crc-t10dif.h
@@ -19,7 +19,7 @@ static inline u16 crc_t10dif_arch(u16 crc, const u8 *p, size_t len)
 }
 
 #define crc_t10dif_mod_init_arch crc_t10dif_mod_init_arch
-static inline void crc_t10dif_mod_init_arch(void)
+static void crc_t10dif_mod_init_arch(void)
 {
 	if (boot_cpu_has(X86_FEATURE_PCLMULQDQ)) {
 		static_branch_enable(&have_pclmulqdq);

lib/crc/x86/crc32.h

View file

diff --git a/lib/crc/x86/crc32.h b/lib/crc/x86/crc32.h
index cea2c96..19a5e3c 100644
--- a/lib/crc/x86/crc32.h
+++ b/lib/crc/x86/crc32.h
@@ -44,7 +44,7 @@ static inline u32 crc32c_arch(u32 crc, const u8 *p, size_t len)
 		return crc32c_base(crc, p, len);
 
 	if (IS_ENABLED(CONFIG_X86_64) && len >= CRC32C_PCLMUL_BREAKEVEN &&
-	    static_branch_likely(&have_pclmulqdq) && crypto_simd_usable()) {
+	    static_branch_likely(&have_pclmulqdq) && likely(irq_fpu_usable())) {
 		/*
 		 * Long length, the vector registers are usable, and the CPU is
 		 * 64-bit and supports both CRC32 and PCLMULQDQ instructions.
@@ -106,7 +106,7 @@ static inline u32 crc32c_arch(u32 crc, const u8 *p, size_t len)
 #define crc32_be_arch crc32_be_base /* not implemented on this arch */
 
 #define crc32_mod_init_arch crc32_mod_init_arch
-static inline void crc32_mod_init_arch(void)
+static void crc32_mod_init_arch(void)
 {
 	if (boot_cpu_has(X86_FEATURE_XMM4_2))
 		static_branch_enable(&have_crc32);

lib/crc/x86/crc64.h

View file

diff --git a/lib/crc/x86/crc64.h b/lib/crc/x86/crc64.h
index fde1222..7d45993 100644
--- a/lib/crc/x86/crc64.h
+++ b/lib/crc/x86/crc64.h
@@ -27,7 +27,7 @@ static inline u64 crc64_nvme_arch(u64 crc, const u8 *p, size_t len)
 }
 
 #define crc64_mod_init_arch crc64_mod_init_arch
-static inline void crc64_mod_init_arch(void)
+static void crc64_mod_init_arch(void)
 {
 	if (boot_cpu_has(X86_FEATURE_PCLMULQDQ)) {
 		static_branch_enable(&have_pclmulqdq);

lib/crypto/tests/hash-test-template.h

View file

diff --git a/lib/crypto/tests/hash-test-template.h b/lib/crypto/tests/hash-test-template.h
index f437a0a..61b43e6 100644
--- a/lib/crypto/tests/hash-test-template.h
+++ b/lib/crypto/tests/hash-test-template.h
@@ -5,11 +5,9 @@
  *

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