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[S390] perf_counter: fix vdso detection 

s390 version of f2053f1a "powerpc/perf_counter: Fix vdso detection".

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2009-10-06 10:34:08 +02:00 committed by Martin Schwidefsky
parent 22ceaf408f
commit 930e44fbea
1 changed files with 8 additions and 8 deletions
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16
arch/s390/kernel/vdso.c
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@ -246,6 +246,13 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
goto out_up;
}
/*
* Put vDSO base into mm struct. We need to do this before calling
* install_special_mapping or the perf counter mmap tracking code
* will fail to recognise it as a vDSO (since arch_vma_name fails).
*/
current->mm->context.vdso_base = vdso_base;
/*
* our vma flags don't have VM_WRITE so by default, the process
* isn't allowed to write those pages.
@ -267,14 +274,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
VM_ALWAYSDUMP,
vdso_pagelist);
if (rc)
goto out_up;
/* Put vDSO base into mm struct */
current->mm->context.vdso_base = vdso_base;
up_write(&mm->mmap_sem);
return 0;
current->mm->context.vdso_base = 0;
out_up:
up_write(&mm->mmap_sem);
return rc;