/* * Copyright 2015, Michael Neuling, IBM Corp. * Licensed under GPLv2. * * Test the kernel's signal delievery code to ensure that we don't * trelaim twice in the kernel signal delivery code. This can happen * if we trigger a signal when in a transaction and the stack pointer * is bogus. * * This test case registers a SEGV handler, sets the stack pointer * (r1) to NULL, starts a transaction and then generates a SEGV. The * SEGV should be handled but we exit here as the stack pointer is * invalid and hance we can't sigreturn. We only need to check that * this flow doesn't crash the kernel. */ #include #include #include #include #include #include #include "utils.h" #include "tm.h" void signal_segv(int signum) { /* This should never actually run since stack is foobar */ exit(1); } int tm_signal_stack() { int pid; SKIP_IF(!have_htm()); pid = fork(); if (pid < 0) exit(1); if (pid) { /* Parent */ /* * It's likely the whole machine will crash here so if * the child ever exits, we are good. */ wait(NULL); return 0; } /* * The flow here is: * 1) register a signal handler (so signal delievery occurs) * 2) make stack pointer (r1) = NULL * 3) start transaction * 4) cause segv */ if (signal(SIGSEGV, signal_segv) == SIG_ERR) exit(1); asm volatile("li 1, 0 ;" /* stack ptr == NULL */ "1:" "tbegin.;" "beq 1b ;" /* retry forever */ "tsuspend.;" "ld 2, 0(1) ;" /* trigger segv" */ : : : "memory"); /* This should never get here due to above segv */ return 1; } int main(void) { return test_harness(tm_signal_stack, "tm_signal_stack"); } ef='/cgit.cgi/linux/net-next.git/tree/sound/soc/amd/acp-pcm-dma.c?id=1db175428ee374489448361213e9c3b749d14900'>treecommitdiff
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authorJan Kara <jack@suse.cz>2016-10-21 11:33:49 +0200
committerDan Williams <dan.j.williams@intel.com>2016-12-26 20:29:25 -0800
commit1db175428ee374489448361213e9c3b749d14900 (patch)
tree32e4eebdad84d1c6e84508186b0f1fb63df7bdfc /sound/soc/amd/acp-pcm-dma.c
parent9f141d6ef6258a3a37a045842d9ba7e68f368956 (diff)
ext4: Simplify DAX fault path
Now that dax_iomap_fault() calls ->iomap_begin() without entry lock, we can use transaction starting in ext4_iomap_begin() and thus simplify ext4_dax_fault(). It also provides us proper retries in case of ENOSPC. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'sound/soc/amd/acp-pcm-dma.c')