From: Chris Zankel Date: Wed, 29 Jan 2014 06:09:51 +0000 (-0800) Subject: xtensa: fix fast_syscall_spill_registers X-Git-Tag: v3.14-rc5~25^2~2 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6b5a1f74e50170e64104135490dc32b657483594;p=pandora-kernel.git xtensa: fix fast_syscall_spill_registers The original implementation could clobber registers under certain conditions. The Xtensa processor architecture uses windowed registers and the original implementation was using a4 as a temporary register, which under certain conditions could be register a0 of the oldest window frame, and didn't always restore the content correctly. By moving the _spill_registers routine inside the fast system call, it frees up one more register (the return address is not required anymore) for the spill routine. Signed-off-by: Chris Zankel --- Reading git-diff-tree failed