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signal: Remove the need for __ARCH_SI_PREABLE_SIZE and SI_PAD_SIZE

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Rework the defintion of struct siginfo so that the array padding
struct siginfo to SI_MAX_SIZE can be placed in a union along side of
the rest of the struct siginfo members.  The result is that we no
longer need the __ARCH_SI_PREAMBLE_SIZE or SI_PAD_SIZE definitions.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman
2018-04-18 17:48:49 -05:00
parent e75dc036c4
commit f283801851
17 changed files with 94 additions and 202 deletions
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3
kernel/signal.c
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@@ -3963,9 +3963,6 @@ __weak const char *arch_vma_name(struct vm_area_struct *vma)
void __init signals_init(void)
{
/* If this check fails, the __ARCH_SI_PREAMBLE_SIZE value is wrong! */
BUILD_BUG_ON(__ARCH_SI_PREAMBLE_SIZE
!= offsetof(struct siginfo, _sifields._pad));
BUILD_BUG_ON(sizeof(struct siginfo) != SI_MAX_SIZE);
sigqueue_cachep = KMEM_CACHE(sigqueue, SLAB_PANIC);