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Ralf Baechle a76ab5c10d [MIPS] MT: Fix bug in multithreaded kernels. ... When GDB writes a breakpoint into address area of inferior process the kernel needs to invalidate the modified memory in the inferior which is done by calling flush_cache_page which in turns calls r4k_flush_cache_page and local_r4k_flush_cache_page for VSMP or SMTC kernel via r4k_on_each_cpu(). As the VSMP and SMTC SMP kernels for 34K are running on a single shared caches it is possible to get away without interprocessor function calls. This optimization is implemented in r4k_on_each_cpu, so local_r4k_flush_cache_page is only ever called on the local CPU. This is where the following code in local_r4k_flush_cache_page() strikes: /* * If ownes no valid ASID yet, cannot possibly have gotten * this page into the cache. */ if (cpu_context(smp_processor_id(), mm) == 0) return; On VSMP and SMTC had a function of cpu_context() for each CPU(TC). So in case another CPU than the CPU executing local_r4k_cache_flush_page has not accessed the mm but one of the other CPUs has there may be data to be flushed in the cache yet local_r4k_cache_flush_page will falsely return leaving the I-cache inconsistent for the breakpoint. While the issue was discovered with GDB it also exists in local_r4k_flush_cache_range() and local_r4k_flush_cache(). Fixed by introducing a new function has_valid_asid which on MT kernels returns true if a mm is active on any processor in the system. This is relativly expensive since for memory acccesses in that loop cache misses have to be assumed but it seems the most viable solution for 2.6.23 and older -stable kernels. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>		18 years ago
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Makefile	[MIPS] Sibyte: Replace SB1 cachecode with standard R4000 class cache code.	18 years ago
c-r3k.c	[MIPS] c-r3k: Implement flush_cache_range()	18 years ago
c-r4k.c	[MIPS] MT: Fix bug in multithreaded kernels.	18 years ago
c-tx39.c	[MIPS] Allow hardwiring of the CPU type to a single type for optimization.	18 years ago
cache.c	Remove dma_cache_(wback|inv|wback_inv) functions	18 years ago
cerr-sb1.c	[MIPS] checkfiles: Fix "need space after that ','" errors.	18 years ago
cex-gen.S	…
cex-sb1.S	…
dma-default.c	[MIPS] Cleanup random difference between the lmo and kernel.org tree.	18 years ago
extable.c	…
fault.c	pid namespaces: define is_global_init() and is_container_init()	18 years ago
highmem.c	…
init.c	[MIPS] Fix aliasing bug in copy_user_highpage, take 2.	18 years ago
ioremap.c	Detach sched.h from mm.h	18 years ago
pg-r4k.c	[MIPS] Allow hardwiring of the CPU type to a single type for optimization.	18 years ago
pg-sb1.c	[MIPS] checkfiles: Fix "need space after that ','" errors.	18 years ago
pgtable-32.c	…
pgtable-64.c	…
pgtable.c	[MIPS] checkfiles: Fix "need space after that ','" errors.	18 years ago
sc-ip22.c	…
sc-mips.c	[MIPS] Fix "no space between function name and open parenthesis" warnings.	18 years ago
sc-r5k.c	…
sc-rm7k.c	…
tlb-r3k.c	…
tlb-r4k.c	[MIPS] Fix "no space between function name and open parenthesis" warnings.	18 years ago
tlb-r8k.c	[MIPS] checkfiles: Fix "need space after that ','" errors.	18 years ago
tlbex-fault.S	…
tlbex.c	[MIPS] Revert "[MIPS] tlbex.c: Cleanup __init usage."	18 years ago