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zstd: disable intrinsics

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Disable the aarch64 NEON SIMD intrinsics for kernel builds.  Safely
using them in the kernel context requires saving/restoring the FPU
registers which is not currently done.

Additionally, remove the aarch64 optimized PREFETCH_L1 and PREFETCH_L2
instruction.  Rely on the more portable compiler built ins.

This lets us remove the problematic workaround in the aarch64_compat.h
header which undefines the __aarch64__ macro.

Reviewed-by: Rob Norris <robn@despairlabs.com>
Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #17904
Closes #17852
This commit is contained in:
Brian Behlendorf
2025-11-07 10:01:12 -08:00
committed by Tony Hutter
parent 0cfd940b6c
commit 6e4acd7893
5 changed files with 10 additions and 66 deletions
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module/zstd/lib/common/compiler.h
-3
View File
@@ -114,9 +114,6 @@
# include <mmintrin.h> /* https://msdn.microsoft.com/fr-fr/library/84szxsww(v=vs.90).aspx */
# define PREFETCH_L1(ptr) _mm_prefetch((const char*)(ptr), _MM_HINT_T0)
# define PREFETCH_L2(ptr) _mm_prefetch((const char*)(ptr), _MM_HINT_T1)
# elif defined(__aarch64__)
# define PREFETCH_L1(ptr) __asm__ __volatile__("prfm pldl1keep, %0" ::"Q"(*(ptr)))
# define PREFETCH_L2(ptr) __asm__ __volatile__("prfm pldl2keep, %0" ::"Q"(*(ptr)))
# elif defined(__GNUC__) && ( (__GNUC__ >= 4) || ( (__GNUC__ == 3) && (__GNUC_MINOR__ >= 1) ) )
# define PREFETCH_L1(ptr) __builtin_prefetch((ptr), 0 /* rw==read */, 3 /* locality */)
# define PREFETCH_L2(ptr) __builtin_prefetch((ptr), 0 /* rw==read */, 2 /* locality */)
module/zstd/lib/common/zstd_internal.h
+9
View File
@@ -11,6 +11,15 @@
#ifndef ZSTD_CCOMMON_H_MODULE
#define ZSTD_CCOMMON_H_MODULE
/*
* Disable the aarch64 NEON SIMD intrinsics for kernel builds. Safely
* using them in the kernel context requires saving/restoring the FPU
* registers which is not currently done.
*/
#ifdef _KERNEL
#define ZSTD_NO_INTRINSICS
#endif
/* this module contains definitions which must be identical
* across compression, decompression and dictBuilder.
* It also contains a few functions useful to at least 2 of them