/* * User-space helper to sort the output of /sys/kernel/debug/page_owner * * Example use: * cat /sys/kernel/debug/page_owner > page_owner_full.txt * grep -v ^PFN page_owner_full.txt > page_owner.txt * ./sort page_owner.txt sorted_page_owner.txt */ #include #include #include #include #include #include #include struct block_list { char *txt; int len; int num; }; static struct block_list *list; static int list_size; static int max_size; struct block_list *block_head; int read_block(char *buf, int buf_size, FILE *fin) { char *curr = buf, *const buf_end = buf + buf_size; while (buf_end - curr > 1 && fgets(curr, buf_end - curr, fin)) { if (*curr == '\n') /* empty line */ return curr - buf; curr += strlen(curr); } return -1; /* EOF or no space left in buf. */ } static int compare_txt(const void *p1, const void *p2) { const struct block_list *l1 = p1, *l2 = p2; return strcmp(l1->txt, l2->txt); } static int compare_num(const void *p1, const void *p2) { const struct block_list *l1 = p1, *l2 = p2; return l2->num - l1->num; } static void add_list(char *buf, int len) { if (list_size != 0 && len == list[list_size-1].len && memcmp(buf, list[list_size-1].txt, len) == 0) { list[list_size-1].num++; return; } if (list_size == max_size) { printf("max_size too small??\n"); exit(1); } list[list_size].txt = malloc(len+1); list[list_size].len = len; list[list_size].num = 1; memcpy(list[list_size].txt, buf, len); list[list_size].txt[len] = 0; list_size++; if (list_size % 1000 == 0) { printf("loaded %d\r", list_size); fflush(stdout); } } #define BUF_SIZE (128 * 1024) int main(int argc, char **argv) { FILE *fin, *fout; char *buf; int ret, i, count; struct block_list *list2; struct stat st; if (argc < 3) { printf("Usage: ./program \n"); perror("open: "); exit(1); } fin = fopen(argv[1], "r"); fout = fopen(argv[2], "w"); if (!fin || !fout) { printf("Usage: ./program \n"); perror("open: "); exit(1); } fstat(fileno(fin), &st); max_size = st.st_size / 100; /* hack ... */ list = malloc(max_size * sizeof(*list)); buf = malloc(BUF_SIZE); if (!list || !buf) { printf("Out of memory\n"); exit(1); } for ( ; ; ) { ret = read_block(buf, BUF_SIZE, fin); if (ret < 0) break; add_list(buf, ret); } printf("loaded %d\n", list_size); printf("sorting ....\n"); qsort(list, list_size, sizeof(list[0]), compare_txt); list2 = malloc(sizeof(*list) * list_size); printf("culling\n"); for (i = count = 0; i < list_size; i++) { if (count == 0 || strcmp(list2[count-1].txt, list[i].txt) != 0) { list2[count++] = list[i]; } else { list2[count-1].num += list[i].num; } } qsort(list2, count, sizeof(list[0]), compare_num); for (i = 0; i < count; i++) fprintf(fout, "%d times:\n%s\n", list2[i].num, list2[i].txt); return 0; } root/net/tipc/link.c
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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2017-02-01 17:45:02 +0000
committerIngo Molnar <mingo@kernel.org>2017-02-01 21:17:49 +0100
commitc8f325a59cfc718d13a50fbc746ed9b415c25e92 (patch)
treed53fbdac9d0781e39a13b2ac6b2bd258cf3b4140 /net/tipc/link.c
parentbf29bddf0417a4783da3b24e8c9e017ac649326f (diff)
efi/fdt: Avoid FDT manipulation after ExitBootServices()
Some AArch64 UEFI implementations disable the MMU in ExitBootServices(), after which unaligned accesses to RAM are no longer supported. Commit: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'net/tipc/link.c')