diff options
| author | Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> | 2019-03-04 22:42:19 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-05-02 19:54:57 +0300 |
| commit | de269129a48a2d590ba1d20c719e19d86e3ddb3f (patch) | |
| tree | f24b4a3afde2d90ce614a347129acf6324315a1a /arch/powerpc/include/asm/time.h | |
| parent | 0acb5f64560a052fd66ab37b212a72964847160f (diff) | |
| download | linux-de269129a48a2d590ba1d20c719e19d86e3ddb3f.tar.xz | |
powerpc/hmi: Fix kernel hang when TB is in error state.
On TOD/TB errors timebase register stops/freezes until HMI error recovery
gets TOD/TB back into running state. On successful recovery, TB starts
running again and udelay() that relies on TB value continues to function
properly. But in case when HMI fails to recover from TOD/TB errors, the
TB register stay freezed. With TB not running the __delay() function
keeps looping and never return. If __delay() is called while in panic
path then system hangs and never reboots after panic.
Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/time.h')
| -rw-r--r-- | arch/powerpc/include/asm/time.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/time.h b/arch/powerpc/include/asm/time.h index 54bf7e68a7e1..57e968413d1e 100644 --- a/arch/powerpc/include/asm/time.h +++ b/arch/powerpc/include/asm/time.h @@ -36,6 +36,8 @@ extern unsigned long ppc_proc_freq; extern unsigned long ppc_tb_freq; #define DEFAULT_TB_FREQ 125000000UL +extern bool tb_invalid; + struct div_result { u64 result_high; u64 result_low; |