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Nicholas Piggin 6eaaf9de35 powerpc/64s/interrupt: Check and fix srr_valid without crashing 
The PPC_RFI_SRR_DEBUG check added by patch "powerpc/64s: avoid reloading
(H)SRR registers if they are still valid" has a few deficiencies. It
does not fix the actual problem, it's not enabled by default, and it
causes a program check interrupt which can cause more difficulties.

However there are a lot of paths which may clobber SRRs or change return
regs, and difficult to have a high confidence that all paths are covered
without wider testing.

Add a relatively low overhead always-enabled check that catches most
such cases, reports once, and fixes it so the kernel can continue.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Rebase, use switch & INT names, squash in race fix from Nick]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
 		2021-06-25 00:06:57 +10:00
..
boot powerpc/boot: Add a boot wrapper for Microwatt 2021-06-21 21:16:32 +10:00
configs powerpc/microwatt: Add microwatt_defconfig 2021-06-21 21:16:32 +10:00
crypto crypto: powepc/sha1 - remove unneeded semicolon 2021-03-07 15:13:14 +11:00
include powerpc/64: use interrupt restart table to speed up return from interrupt 2021-06-25 00:06:56 +10:00
kernel powerpc/64s/interrupt: Check and fix srr_valid without crashing 2021-06-25 00:06:57 +10:00
kexec powerpc/kexec_file: Use current CPU info while setting up FDT 2021-05-04 22:26:57 +10:00
kvm powerpc/64s: avoid reloading (H)SRR registers if they are still valid 2021-06-25 00:06:55 +10:00
lib powerpc/64: use interrupt restart table to speed up return from interrupt 2021-06-25 00:06:56 +10:00
math-emu powerpc/64s: avoid reloading (H)SRR registers if they are still valid 2021-06-25 00:06:55 +10:00
mm powerpc/64s: Fix boot failure with 4K Radix 2021-06-25 00:06:54 +10:00
net powerpc/bpf: Write protect JIT code 2021-06-21 21:13:21 +10:00
perf powerpc: make stack walking KASAN-safe 2021-06-17 00:09:11 +10:00
platforms powerpc/64s: avoid reloading (H)SRR registers if they are still valid 2021-06-25 00:06:55 +10:00
purgatory powerpc/kexec: Don't use .machine ppc64 in trampoline_64.S 2021-04-08 21:17:43 +10:00
sysdev powerpc/64s: avoid reloading (H)SRR registers if they are still valid 2021-06-25 00:06:55 +10:00
tools powerpc/tools: Remove 90 line limit in checkpatch script 2020-09-08 22:57:11 +10:00
xmon powerpc/64s: avoid reloading (H)SRR registers if they are still valid 2021-06-25 00:06:55 +10:00
Kbuild powerpc/kexec: Move kexec files into a dedicated subdir. 2019-11-21 15:41:34 +11:00
Kconfig powerpc: Add Microwatt platform 2021-06-21 21:15:26 +10:00
Kconfig.debug powerpc/64s: avoid reloading (H)SRR registers if they are still valid 2021-06-25 00:06:55 +10:00
Makefile powerpc/Makefile: Add ppc32/ppc64_randconfig targets 2021-05-23 20:51:35 +10:00
Makefile.postlink powerpc: unrel_branch_check.sh: use nm to find symbol value 2020-09-02 11:00:22 +10:00