https://github.com/torvalds/linux
Revision 16f77de82f2d2f628306dab9bc4799df0d28a199 authored by Paul Burton on 18 June 2014, 14:00:46 UTC, committed by Ralf Baechle on 26 June 2014, 09:48:18 UTC
This reverts commit eec43a224cf1 "MIPS: Save/restore MSA context around signals" and the MSA parts of ca750649e08c "MIPS: kernel: signal: Prevent save/restore FPU context in user memory" (the restore path of which appears incorrect anyway...). The reverted patch took care not to break compatibility with userland users of struct sigcontext, but inadvertantly changed the offset of the uc_sigmask field of struct ucontext. Thus Linux v3.15 breaks the userland ABI. The MSA context will need to be saved via some other opt-in mechanism, but for now revert the change to reduce the fallout. This will have minimal impact upon use of MSA since the only supported CPU which includes it (the P5600) is 32-bit and therefore requires that the experimental CONFIG_MIPS_O32_FP64_SUPPORT Kconfig option be selected before the kernel will set FR=1 for a task, a requirement for MSA use. Thus the users of MSA are limited to known small groups of people & this patch won't be breaking any previously working MSA-using userland outside of experimental settings. [ralf@linux-mips.org: Fixed rejects.] Cc: stable@vger.kernel.org Reported-by: Joseph S. Myers <joseph@codesourcery.com> Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: linux-mips@linux-mips.org Cc: stable@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/7107/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Tip revision: 16f77de82f2d2f628306dab9bc4799df0d28a199 authored by Paul Burton on 18 June 2014, 14:00:46 UTC
Revert "MIPS: Save/restore MSA context around signals"
Revert "MIPS: Save/restore MSA context around signals"
Tip revision: 16f77de
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Makefile | -rw-r--r-- | 50.8 KB |
README | -rw-r--r-- | 18.3 KB |
REPORTING-BUGS | -rw-r--r-- | 7.3 KB |
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