From: Alex Smith Date: Thu, 1 May 2014 11:51:19 +0000 (+0100) Subject: MIPS: ptrace: Avoid smp_processor_id() in preemptible code X-Git-Tag: omap-for-v3.16/fixes-against-rc1~115^2~1 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=57c7ea513f0e4b033ba602550992e2ca0e6b8d2c;p=pandora-kernel.git MIPS: ptrace: Avoid smp_processor_id() in preemptible code ptrace_{get,set}_watch_regs access current_cpu_data to get the watch register count/masks, which calls smp_processor_id(). However they are run in preemptible context and therefore trigger warnings like so: [ 6340.092000] BUG: using smp_processor_id() in preemptible [00000000] code: gdb/367 [ 6340.092000] caller is ptrace_get_watch_regs+0x44/0x220 Since the watch register count/masks should be the same across all CPUs, use boot_cpu_data instead. Note that this may need to change in future should a heterogenous system be supported where the count/masks are not the same across all CPUs (the current code is also incorrect for this scenario - current_cpu_data here would not necessarily be correct for the CPU that the target task will execute on). Signed-off-by: Alex Smith Reviewed-by: Paul Burton Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6879/ Signed-off-by: Ralf Baechle --- Reading git-diff-tree failed