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authorMark Rutland <mark.rutland@arm.com>2022-02-07 10:19:43 +0000
committerPeter Zijlstra <peterz@infradead.org>2022-02-11 12:13:56 +0100
commitdc1b4df09acdca7a89806b28f235cd6d8dcd3d24 (patch)
tree4f3f0addba6069a79697021068d185f695a9f98a /scripts/atomic
parentc441e934b604a3b5f350a9104124cf6a3ba07a34 (diff)
atomics: Fix atomic64_{read_acquire,set_release} fallbacks
Arnd reports that on 32-bit architectures, the fallbacks for atomic64_read_acquire() and atomic64_set_release() are broken as they use smp_load_acquire() and smp_store_release() respectively, which do not work on types larger than the native word size. Since those contain compiletime_assert_atomic_type(), any attempt to use those fallbacks will result in a build-time error. e.g. with the following added to arch/arm/kernel/setup.c: | void test_atomic64(atomic64_t *v) | { | atomic64_set_release(v, 5); | atomic64_read_acquire(v); | } The compiler will complain as follows: | In file included from <command-line>: | In function 'arch_atomic64_set_release', | inlined from 'test_atomic64' at ./include/linux/atomic/atomic-instrumented.h:669:2: | ././include/linux/compiler_types.h:346:38: error: call to '__compiletime_assert_9' declared with attribute error: Need native word sized stores/loads for atomicity. | 346 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | | ^ | ././include/linux/compiler_types.h:327:4: note: in definition of macro '__compiletime_assert' | 327 | prefix ## suffix(); \ | | ^~~~~~ | ././include/linux/compiler_types.h:346:2: note: in expansion of macro '_compiletime_assert' | 346 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | | ^~~~~~~~~~~~~~~~~~~ | ././include/linux/compiler_types.h:349:2: note: in expansion of macro 'compiletime_assert' | 349 | compiletime_assert(__native_word(t), \ | | ^~~~~~~~~~~~~~~~~~ | ./include/asm-generic/barrier.h:133:2: note: in expansion of macro 'compiletime_assert_atomic_type' | 133 | compiletime_assert_atomic_type(*p); \ | | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | ./include/asm-generic/barrier.h:164:55: note: in expansion of macro '__smp_store_release' | 164 | #define smp_store_release(p, v) do { kcsan_release(); __smp_store_release(p, v); } while (0) | | ^~~~~~~~~~~~~~~~~~~ | ./include/linux/atomic/atomic-arch-fallback.h:1270:2: note: in expansion of macro 'smp_store_release' | 1270 | smp_store_release(&(v)->counter, i); | | ^~~~~~~~~~~~~~~~~ | make[2]: *** [scripts/Makefile.build:288: arch/arm/kernel/setup.o] Error 1 | make[1]: *** [scripts/Makefile.build:550: arch/arm/kernel] Error 2 | make: *** [Makefile:1831: arch/arm] Error 2 Fix this by only using smp_load_acquire() and smp_store_release() for native atomic types, and otherwise falling back to the regular barriers necessary for acquire/release semantics, as we do in the more generic acquire and release fallbacks. Since the fallback templates are used to generate the atomic64_*() and atomic_*() operations, the __native_word() check is added to both. For the atomic_*() operations, which are always 32-bit, the __native_word() check is redundant but not harmful, as it is always true. For the example above this works as expected on 32-bit, e.g. for arm multi_v7_defconfig: | <test_atomic64>: | push {r4, r5} | dmb ish | pldw [r0] | mov r2, #5 | mov r3, #0 | ldrexd r4, [r0] | strexd r4, r2, [r0] | teq r4, #0 | bne 484 <test_atomic64+0x14> | ldrexd r2, [r0] | dmb ish | pop {r4, r5} | bx lr ... and also on 64-bit, e.g. for arm64 defconfig: | <test_atomic64>: | bti c | paciasp | mov x1, #0x5 | stlr x1, [x0] | ldar x0, [x0] | autiasp | ret Reported-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Boqun Feng <boqun.feng@gmail.com> Link: https://lore.kernel.org/r/20220207101943.439825-1-mark.rutland@arm.com
Diffstat (limited to 'scripts/atomic')
-rwxr-xr-xscripts/atomic/fallbacks/read_acquire11
-rwxr-xr-xscripts/atomic/fallbacks/set_release7
2 files changed, 16 insertions, 2 deletions
diff --git a/scripts/atomic/fallbacks/read_acquire b/scripts/atomic/fallbacks/read_acquire
index 803ba7561076..a0ea1d26e6b2 100755
--- a/scripts/atomic/fallbacks/read_acquire
+++ b/scripts/atomic/fallbacks/read_acquire
@@ -2,6 +2,15 @@ cat <<EOF
static __always_inline ${ret}
arch_${atomic}_read_acquire(const ${atomic}_t *v)
{
- return smp_load_acquire(&(v)->counter);
+ ${int} ret;
+
+ if (__native_word(${atomic}_t)) {
+ ret = smp_load_acquire(&(v)->counter);
+ } else {
+ ret = arch_${atomic}_read(v);
+ __atomic_acquire_fence();
+ }
+
+ return ret;
}
EOF
diff --git a/scripts/atomic/fallbacks/set_release b/scripts/atomic/fallbacks/set_release
index 86ede759f24e..05cdb7f42477 100755
--- a/scripts/atomic/fallbacks/set_release
+++ b/scripts/atomic/fallbacks/set_release
@@ -2,6 +2,11 @@ cat <<EOF
static __always_inline void
arch_${atomic}_set_release(${atomic}_t *v, ${int} i)
{
- smp_store_release(&(v)->counter, i);
+ if (__native_word(${atomic}_t)) {
+ smp_store_release(&(v)->counter, i);
+ } else {
+ __atomic_release_fence();
+ arch_${atomic}_set(v, i);
+ }
}
EOF