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authorMichael Ellerman <mpe@ellerman.id.au>2017-05-19 11:29:04 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2017-05-19 19:46:34 +1000
commitfe06fe860250a4f01d0eaf70a2563b1997174a74 (patch)
tree0bcce900e1a98434d35aa9bf6e9a4dfccc80d800 /tools
parente41e53cd4fe331d0d1f06f8e4ed7e2cc63ee2c34 (diff)
selftests/powerpc: Fix TM resched DSCR test with some compilers
The tm-resched-dscr test has started failing sometimes, depending on what compiler it's built with, eg: test: tm_resched_dscr Check DSCR TM context switch: tm-resched-dscr: tm-resched-dscr.c:76: test_body: Assertion `rv' failed. !! child died by signal 6 When it fails we see that the compiler doesn't initialise rv to 1 before entering the inline asm block. Although that's counter intuitive, it is allowed because we tell the compiler that the inline asm will write to rv (using "=r"), meaning the original value is irrelevant. Marking it as a read/write parameter would presumably work, but it seems simpler to fix it by setting the initial value of rv in the inline asm. Fixes: 96d016108640 ("powerpc: Correct DSCR during TM context switch") Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Acked-by: Michael Neuling <mikey@neuling.org>
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/powerpc/tm/tm-resched-dscr.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/testing/selftests/powerpc/tm/tm-resched-dscr.c b/tools/testing/selftests/powerpc/tm/tm-resched-dscr.c
index d9c49f41515e..e79ccd6aada1 100644
--- a/tools/testing/selftests/powerpc/tm/tm-resched-dscr.c
+++ b/tools/testing/selftests/powerpc/tm/tm-resched-dscr.c
@@ -42,12 +42,12 @@ int test_body(void)
printf("Check DSCR TM context switch: ");
fflush(stdout);
for (;;) {
- rv = 1;
asm __volatile__ (
/* set a known value into the DSCR */
"ld 3, %[dscr1];"
"mtspr %[sprn_dscr], 3;"
+ "li %[rv], 1;"
/* start and suspend a transaction */
"tbegin.;"
"beq 1f;"

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