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Message-ID: <20190111103225.GA4729@zn.tnic> Date: Fri, 11 Jan 2019 11:32:25 +0100 From: Borislav Petkov <bp@...en8.de> To: Chao Fan <fanc.fnst@...fujitsu.com> Cc: linux-kernel@...r.kernel.org, x86@...nel.org, tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, keescook@...omium.org, bhe@...hat.com, msys.mizuma@...il.com, indou.takao@...fujitsu.com, caoj.fnst@...fujitsu.com Subject: Re: [PATCH v15 3/6] x86/boot: Introduce efi_get_rsdp_addr() to find RSDP from EFI table On Fri, Jan 11, 2019 at 09:23:53AM +0800, Chao Fan wrote: > Yes, 'table64' looks superfluous here, but after these lines, there is: > if (!IS_ENABLED(CONFIG_X86_64) && table64 >> 32) { > so the 'table64' is useful here for i386. 'table' is unsigned long, it > can't do the right shift. But the 'table64' who is u64 can do that right > shift. Have you actually tried fixing what I suggested or you're just talking? --- diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c index e9dd84f459ed..0537d46fb21f 100644 --- a/arch/x86/boot/compressed/acpi.c +++ b/arch/x86/boot/compressed/acpi.c @@ -77,21 +77,19 @@ static acpi_physical_address efi_get_rsdp_addr(void) sizeof(efi_config_table_32_t); for (i = 0; i < systab->nr_tables; i++) { + acpi_physical_address table; void *config_tables; - unsigned long table; efi_guid_t guid; config_tables = (void *)(systab->tables + size * i); if (efi_64) { efi_config_table_64_t *tmp_table; - u64 table64; tmp_table = config_tables; guid = tmp_table->guid; - table64 = tmp_table->table; - table = table64; + table = tmp_table->table; - if (!IS_ENABLED(CONFIG_X86_64) && table64 >> 32) { + if (!IS_ENABLED(CONFIG_X86_64) && table >> 32) { debug_putstr("Error getting RSDP address: EFI config table located above 4GB.\n"); return 0; } -- Regards/Gruss, Boris. Good mailing practices for 400: avoid top-posting and trim the reply.
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