modify sin led gpio

hc

2024-05-13 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e

 kernel/arch/x86/kernel/aperture_64.c
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@@ -270,18 +270,23 @@
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 }
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 early_param("gart_fix_e820", parse_gart_mem);
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+/*
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+ * With kexec/kdump, if the first kernel doesn't shut down the GART and the
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+ * second kernel allocates a different GART region, there might be two
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+ * overlapping GART regions present:
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+ *
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+ * - the first still used by the GART initialized in the first kernel.
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+ * - (sub-)set of it used as normal RAM by the second kernel.
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+ *
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+ * which leads to memory corruptions and a kernel panic eventually.
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+ *
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+ * This can also happen if the BIOS has forgotten to mark the GART region
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+ * as reserved.
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+ *
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+ * Try to update the e820 map to mark that new region as reserved.
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+ */
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 void __init early_gart_iommu_check(void)
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 {
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-	/*
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-	 * in case it is enabled before, esp for kexec/kdump,
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-	 * previous kernel already enable that. memset called
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-	 * by allocate_aperture/__alloc_bootmem_nopanic cause restart.
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-	 * or second kernel have different position for GART hole. and new
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-	 * kernel could use hole as RAM that is still used by GART set by
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-	 * first kernel
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-	 * or BIOS forget to put that in reserved.
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-	 * try to update e820 to make that region as reserved.
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-	 */
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 	u32 agp_aper_order = 0;
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 	int i, fix, slot, valid_agp = 0;
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 	u32 ctl;