kexec: fix OOPS in crash_kernel_shrink

Two "echo 0 > /sys/kernel/kexec_crash_size" OOPSes kernel. Also content of this file is invalid after first shrink to zero: it shows 1 instead of 0. This scenario is unlikely to happen often (root privs, valid crashkernel= in cmdline, dump-capture kernel not loaded), I hit it only by chance. This patch fixes it.

Vitaly Mayatskikh committed 16 years ago

Commit 475f9aa1 parent d586ebb1 file · +2 −4Browse files

Showing the changes to kernel (1 of 1 file). Show all

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kernel/kexec.c+2−4

@@ -1134,11 +1134,9 @@ int crash_shrink_memory(unsigned long new_size) · 1133 unmodified lines
1134	1134
1135	1135	free_reserved_phys_range(end, crashk_res.end);
1136	1136
1137		− if (start == end) {
1138		− crashk_res.end = end;
	1137	+ if (start == end)
1139	1138	release_resource(&crashk_res);
1140		− } else
1141		− crashk_res.end = end - 1;
	1139	+ crashk_res.end = end - 1;
1142	1140
1143	1141	unlock:
1144	1142	mutex_unlock(&kexec_mutex);