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authorAtish Patra <atish.patra@wdc.com>2019-10-09 15:00:57 -0700
committerPaul Walmsley <paul.walmsley@sifive.com>2019-10-28 11:13:59 -0700
commit1edd28b7e85d51996885d1e4700ccddd4270c7bb (patch)
tree4c039eaecee769e5f5fc33419771ddeab5395d0f /arch/riscv
parentd6d5df1db6e9d7f8f76d2911707f7d5877251b02 (diff)
RISC-V: Remove unsupported isa string info print
/proc/cpuinfo should just print all the isa string as an information instead of determining what is supported or not. ELF hwcap can be used by the userspace to figure out that. Simplify the isa string printing by removing the unsupported isa string print and all related code. The relevant discussion can be found at http://lists.infradead.org/pipermail/linux-riscv/2019-September/006702.html Signed-off-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: http://lists.infradead.org/pipermail/linux-riscv/2019-September/006702.html Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
Diffstat (limited to 'arch/riscv')
-rw-r--r--arch/riscv/kernel/cpu.c45
1 files changed, 3 insertions, 42 deletions
diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
index 7da3c6a93abd..40a3c442ac5f 100644
--- a/arch/riscv/kernel/cpu.c
+++ b/arch/riscv/kernel/cpu.c
@@ -46,51 +46,12 @@ int riscv_of_processor_hartid(struct device_node *node)
#ifdef CONFIG_PROC_FS
-static void print_isa(struct seq_file *f, const char *orig_isa)
+static void print_isa(struct seq_file *f, const char *isa)
{
- static const char *ext = "mafdcsu";
- const char *isa = orig_isa;
- const char *e;
-
- /*
- * Linux doesn't support rv32e or rv128i, and we only support booting
- * kernels on harts with the same ISA that the kernel is compiled for.
- */
-#if defined(CONFIG_32BIT)
- if (strncmp(isa, "rv32i", 5) != 0)
- return;
-#elif defined(CONFIG_64BIT)
- if (strncmp(isa, "rv64i", 5) != 0)
- return;
-#endif
-
- /* Print the base ISA, as we already know it's legal. */
+ /* Print the entire ISA as it is */
seq_puts(f, "isa\t\t: ");
- seq_write(f, isa, 5);
- isa += 5;
-
- /*
- * Check the rest of the ISA string for valid extensions, printing those
- * we find. RISC-V ISA strings define an order, so we only print the
- * extension bits when they're in order. Hide the supervisor (S)
- * extension from userspace as it's not accessible from there.
- */
- for (e = ext; *e != '\0'; ++e) {
- if (isa[0] == e[0]) {
- if (isa[0] != 's')
- seq_write(f, isa, 1);
-
- isa++;
- }
- }
+ seq_write(f, isa, strlen(isa));
seq_puts(f, "\n");
-
- /*
- * If we were given an unsupported ISA in the device tree then print
- * a bit of info describing what went wrong.
- */
- if (isa[0] != '\0')
- pr_info("unsupported ISA \"%s\" in device tree\n", orig_isa);
}
static void print_mmu(struct seq_file *f, const char *mmu_type)