xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

powerpc: Fix DSCR inheritance over fork()

Browse Source 
Two DSCR tests have a hack in them:

	/*
	 * XXX: Force a context switch out so that DSCR
	 * current value is copied into the thread struct
	 * which is required for the child to inherit the
	 * changed value.
	 */
	sleep(1);

We should not be working around this in the testcase, it is a kernel bug.
Fix it by copying the current DSCR to the child, instead of what we
had in the thread struct at last context switch.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Anton Blanchard
2015-12-09 20:11:47 +11:00
committed by Michael Ellerman
parent 20dbe67062
commit db1231dcdb
3 changed files with 1 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
tools/testing/selftests/powerpc/dscr/dscr_inherit_exec_test.c
View File

@@ -60,14 +60,6 @@ int dscr_inherit_exec(void)
else
set_dscr(dscr);
/*
* XXX: Force a context switch out so that DSCR
* current value is copied into the thread struct
* which is required for the child to inherit the
* changed value.
*/
sleep(1);
pid = fork();
if (pid == -1) {
perror("fork() failed");

8
tools/testing/selftests/powerpc/dscr/dscr_inherit_test.c
View File

@@ -40,14 +40,6 @@ int dscr_inherit(void)
else
set_dscr(dscr);
/*
* XXX: Force a context switch out so that DSCR
* current value is copied into the thread struct
* which is required for the child to inherit the
* changed value.
*/
sleep(1);
pid = fork();
if (pid == -1) {
perror("fork() failed");