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Date:	Tue, 06 Oct 2015 11:05:43 +0530
From:	Manjeet Pawar <>
Cc:, Manjeet Pawar <>,
	Akhilesh Kumar <>,
	Rohit Thapliyal <>

MINSIGSTKSZ and SIGSTKSZ for ARM64 are not correctly set in latest kernel.
This patch fixes this issue.

This issue is reported in LTP (testcase: sigaltstack02.c).
Testcase failed when sigaltstack() called with stack size "MINSIGSTKSZ - 1"
Since in Glibc-2.22, MINSIGSTKSZ is set to 5120 but in kernel
it is set to 2048 so testcase gets failed.

Testcase Output:
sigaltstack02 1  TPASS  :  stgaltstack() fails, Invalid Flag value,errno:22
sigaltstack02 2  TFAIL  :  sigaltstack() returned 0, expected -1,errno:12

Reported Issue in Glibc Bugzilla:

Bugfix in Glibc-2.22:;a=blob;f=sysdeps/unix/

Signed-off-by: Akhilesh Kumar <>
Signed-off-by: Manjeet Pawar <>
Signed-off-by: Rohit Thapliyal <>

v1 -> Changes in uapi overall header
v2 -> Changes done in arm64 headers

 arch/arm64/include/uapi/asm/signal.h |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/include/uapi/asm/signal.h b/arch/arm64/include/uapi/asm/signal.h
index 8d1e723..5ac56cf 100644
--- a/arch/arm64/include/uapi/asm/signal.h
+++ b/arch/arm64/include/uapi/asm/signal.h
@@ -21,4 +21,9 @@
 #include <asm-generic/signal.h>
+#undef SIGSTKSZ
+#define MINSIGSTKSZ 5120
+#define SIGSTKSZ    16384

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