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Linux: Remove remnants of the getcpu cache

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The getcpu cache was removed from the kernel in Linux 2.6.24.  glibc
support from the sched_getcpu implementation was removed in commit
dd26c44403 ("Consolidate sched_getcpu").
This commit is contained in:
Florian Weimer
2020-05-15 11:32:30 +02:00
parent 61d64408a1
commit 501bdb5dd6
6 changed files with 1 additions and 40 deletions
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5
sysdeps/unix/sysv/linux/pthread_setaffinity.c
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@ -33,11 +33,6 @@ __pthread_setaffinity_new (pthread_t th, size_t cpusetsize,
res = INTERNAL_SYSCALL_CALL (sched_setaffinity, pd->tid, cpusetsize,
cpuset);
#ifdef RESET_VGETCPU_CACHE
if (!INTERNAL_SYSCALL_ERROR_P (res))
RESET_VGETCPU_CACHE ();
#endif
return (INTERNAL_SYSCALL_ERROR_P (res)
? INTERNAL_SYSCALL_ERRNO (res)
: 0);

5
sysdeps/unix/sysv/linux/sched_setaffinity.c
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@ -32,11 +32,6 @@ __sched_setaffinity_new (pid_t pid, size_t cpusetsize, const cpu_set_t *cpuset)
{
int result = INLINE_SYSCALL (sched_setaffinity, 3, pid, cpusetsize, cpuset);
#ifdef RESET_VGETCPU_CACHE
if (result != -1)
RESET_VGETCPU_CACHE ();
#endif
return result;
}
libc_hidden_def (__sched_setaffinity_new)

14
sysdeps/unix/sysv/linux/x86_64/pthread_setaffinity.c
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@ -1,14 +0,0 @@
#include <tls.h>
#define RESET_VGETCPU_CACHE() \
do { \
asm volatile ("movl %0, %%fs:%P1\n\t" \
"movl %0, %%fs:%P2" \
: \
: "ir" (0), "i" (offsetof (struct pthread, \
header.vgetcpu_cache[0])), \
"i" (offsetof (struct pthread, \
header.vgetcpu_cache[1]))); \
} while (0)
#include <sysdeps/unix/sysv/linux/pthread_setaffinity.c>

14
sysdeps/unix/sysv/linux/x86_64/sched_setaffinity.c
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@ -1,14 +0,0 @@
#include <tls.h>
#define RESET_VGETCPU_CACHE() \
do { \
asm volatile ("movl %0, %%fs:%P1\n\t" \
"movl %0, %%fs:%P2" \
: \
: "ir" (0), "i" (offsetof (struct pthread, \
header.vgetcpu_cache[0])), \
"i" (offsetof (struct pthread, \
header.vgetcpu_cache[1]))); \
} while (0)
#include "../sched_setaffinity.c"

1
sysdeps/x86_64/nptl/tcb-offsets.sym
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@ -11,7 +11,6 @@ CLEANUP_PREV offsetof (struct _pthread_cleanup_buffer, __prev)
MUTEX_FUTEX offsetof (pthread_mutex_t, __data.__lock)
MULTIPLE_THREADS_OFFSET offsetof (tcbhead_t, multiple_threads)
POINTER_GUARD offsetof (tcbhead_t, pointer_guard)
VGETCPU_CACHE_OFFSET offsetof (tcbhead_t, vgetcpu_cache)
FEATURE_1_OFFSET offsetof (tcbhead_t, feature_1)
SSP_BASE_OFFSET offsetof (tcbhead_t, ssp_base)

2
sysdeps/x86_64/nptl/tls.h
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@ -50,7 +50,7 @@ typedef struct
uintptr_t sysinfo;
uintptr_t stack_guard;
uintptr_t pointer_guard;
unsigned long int vgetcpu_cache[2];
unsigned long int unused_vgetcpu_cache[2];
/* Bit 0: X86_FEATURE_1_IBT.
Bit 1: X86_FEATURE_1_SHSTK.
*/