From 2f9284e4e3be7b0b4d8d0638f9805603069a762d Mon Sep 17 00:00:00 2001 From: Dmitry Adamushko Date: Tue, 23 Sep 2008 22:56:35 +0200 Subject: [PATCH] x86, microcode_amd: cleanup, mark request_microcode_user() as unsupported (1) mark mc_size in generic_load_microcode() as unitialized_var to avoid gcc's (false) warning; (2) mark request_microcode_user() as unsupported. The required changes can be added later. Note, we don't break any user-space interfaces here, as there were no kernels with support for AMD-specific ucode update yet. The ucode has to be updated via 'firmware'. Signed-off-by: Dmitry Adamushko Signed-off-by: Ingo Molnar --- arch/x86/kernel/microcode_amd.c | 36 ++++----------------------------- 1 file changed, 4 insertions(+), 32 deletions(-) diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c index 829415208ff..7a1f8eeac2c 100644 --- a/arch/x86/kernel/microcode_amd.c +++ b/arch/x86/kernel/microcode_amd.c @@ -120,29 +120,7 @@ static int get_matching_microcode(int cpu, void *mc, int rev) unsigned int equiv_cpu_id = 0x00; unsigned int i = 0; - /* - * FIXME! dimm: do we need this? Why an update via /dev/... is different - * from the one via firmware? - * - * This is a tricky part. We might be called from a write operation - * to the device file instead of the usual process of firmware - * loading. This routine needs to be able to distinguish both - * cases. This is done by checking if there alread is a equivalent - * CPU table installed. If not, we're written through - * /dev/cpu/microcode. - * Since we ignore all checks. The error case in which going through - * firmware loading and that table is not loaded has already been - * checked earlier. - */ BUG_ON(equiv_cpu_table == NULL); -#if 0 - if (equiv_cpu_table == NULL) { - printk(KERN_INFO "microcode: CPU%d microcode update with " - "version 0x%x (current=0x%x)\n", - cpu, mc_header->patch_id, uci->cpu_sig.rev); - goto out; - } -#endif current_cpu_id = cpuid_eax(0x00000001); while (equiv_cpu_table[i].installed_cpu != 0) { @@ -362,7 +340,7 @@ static int generic_load_microcode(int cpu, void *data, size_t size, leftover = size - offset; while (leftover) { - unsigned int mc_size; + unsigned int uninitialized_var(mc_size); struct microcode_header_amd *mc_header; mc = get_next_ucode(ucode_ptr, leftover, get_ucode_data, &mc_size); @@ -428,17 +406,11 @@ static int request_microcode_fw(int cpu, struct device *device) return ret; } -static int get_ucode_user(void *to, const void *from, size_t n) -{ - return copy_from_user(to, from, n); -} - static int request_microcode_user(int cpu, const void __user *buf, size_t size) { - /* We should bind the task to the CPU */ - BUG_ON(cpu != raw_smp_processor_id()); - - return generic_load_microcode(cpu, (void*)buf, size, &get_ucode_user); + printk(KERN_WARNING "microcode: AMD microcode update via /dev/cpu/microcode" + "is not supported\n"); + return -1; } static void microcode_fini_cpu_amd(int cpu) -- 2.41.0