linux-toradex.git/arch/mips/lib/delay.c, branch v3.0.95 Linux kernel for Apalis and Colibri modules MIPS: delay: Fix use of current_cpu_data in preemptable code. 2010-04-12T16:26:09+00:00 Ralf Baechle ralf@linux-mips.org 2010-03-10T15:16:04+00:00 abe5b417fb4a52e9510fdb5a16e722e91bf89e92 This may lead to warnings like: BUG: using smp_processor_id() in preemptible [00000000] code: reboot/1989 caller is __udelay+0x14/0x70 Call Trace: [<ffffffff8110ad28>] dump_stack+0x8/0x34 [<ffffffff812dde04>] debug_smp_processor_id+0xf4/0x110 [<ffffffff812d90bc>] __udelay+0x14/0x70 [<ffffffff81378274>] md_notify_reboot+0x12c/0x148 [<ffffffff81161054>] notifier_call_chain+0x64/0xc8 [<ffffffff811614dc>] __blocking_notifier_call_chain+0x64/0xc0 [<ffffffff8115566c>] kernel_restart_prepare+0x1c/0x38 [<ffffffff811556cc>] kernel_restart+0x14/0x50 [<ffffffff8115581c>] SyS_reboot+0x10c/0x1f0 [<ffffffff81103684>] handle_sysn32+0x44/0x84 Signed-off-by: Ralf Baechle <ralf@linux-mips.org> 
This may lead to warnings like:

BUG: using smp_processor_id() in preemptible [00000000] code: reboot/1989
caller is __udelay+0x14/0x70
Call Trace:
[<ffffffff8110ad28>] dump_stack+0x8/0x34
[<ffffffff812dde04>] debug_smp_processor_id+0xf4/0x110
[<ffffffff812d90bc>] __udelay+0x14/0x70
[<ffffffff81378274>] md_notify_reboot+0x12c/0x148
[<ffffffff81161054>] notifier_call_chain+0x64/0xc8
[<ffffffff811614dc>] __blocking_notifier_call_chain+0x64/0xc0
[<ffffffff8115566c>] kernel_restart_prepare+0x1c/0x38
[<ffffffff811556cc>] kernel_restart+0x14/0x50
[<ffffffff8115581c>] SyS_reboot+0x10c/0x1f0
[<ffffffff81103684>] handle_sysn32+0x44/0x84

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
MIPS: Fix __ndelay build error and add 'ull' suffix for 32-bit kernel 2009-06-17T10:06:24+00:00 Atsushi Nemoto nemoto@toshiba-tops.co.jp 2009-06-09T02:12:48+00:00 3cb3a66cf7559d9c5d47ddf58481530b8943052f Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org> 
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
MIPS: Outline udelay and fix a few issues. 2009-06-08T15:57:51+00:00 Ralf Baechle ralf@linux-mips.org 2009-02-28T09:44:28+00:00 5636919b5c909fee54a6ef5226475ecae012ad02 Outlining fixes the issue were on certain CPUs such as the R10000 family the delay loop would need an extra cycle if it overlaps a cacheline boundary. The rewrite also fixes build errors with GCC 4.4 which was changed in way incompatible with the kernel's inline assembly. Relying on pure C for computation of the delay value removes the need for explicit. The price we pay is a slight slowdown of the computation - to be fixed on another day. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> 
Outlining fixes the issue were on certain CPUs such as the R10000 family
the delay loop would need an extra cycle if it overlaps a cacheline
boundary.

The rewrite also fixes build errors with GCC 4.4 which was changed in
way incompatible with the kernel's inline assembly.

Relying on pure C for computation of the delay value removes the need for
explicit.  The price we pay is a slight slowdown of the computation - to
be fixed on another day.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>