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22e6a2e14c
linux/arch/riscv/kernel
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Anup Patel 22e6a2e14c
RISC-V: Make BSS section as the last section in vmlinux.lds.S 
The objcopy only emits loadable sections when creating flat kernel
Image. To have minimal possible size of flat kernel Image, we should
have all non-loadable sections after loadable sections.

Currently, execption table section (loadable section) is after BSS
section (non-loadable section) in the RISC-V vmlinux.lds.S. This
is not optimal for having minimal flat kernel Image size hence this
patch makes BSS section as the last section in RISC-V vmlinux.lds.S.

In addition, we make BSS section aligned to 16byte instead of PAGE
aligned which further reduces flat kernel Image size by few KBs.

The flat kernel Image size of Linux-4.20-rc4 using GCC 8.2.0 is
8819980 bytes with current RISC-V vmlinux.lds.S and it reduces to
7991740 bytes with this patch applied. In summary, this patch reduces
Linux-4.20-rc4 flat kernel Image size by 809 KB.

Signed-off-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-01-07 07:59:25 -08:00
..
vdso RISC-V: Use KBUILD_CFLAGS instead of KCFLAGS when building the vDSO 2018-08-13 08:31:28 -07:00
.gitignore RISC-V: Build Infrastructure 2017-09-26 15:26:49 -07:00
asm-offsets.c RISC-V: Task implementation 2017-09-26 15:26:46 -07:00
cacheinfo.c RISC-V: Fix of_node_* refcount 2018-12-21 08:10:49 -08:00
cpu.c RISC-V: Fix of_node_* refcount 2018-12-21 08:10:49 -08:00
cpufeature.c RISC-V: Fix of_node_* refcount 2018-12-21 08:10:49 -08:00
entry.S RISC-V: SMP cleanup and new features 2018-10-22 17:41:43 -07:00
fpu.S Extract FPU context operations from entry.S 2018-10-22 17:02:22 -07:00
ftrace.c riscv: remove unused variable in ftrace 2018-12-21 08:11:26 -08:00
head.S RISC-V: Build flat and compressed kernel images 2018-11-20 05:19:09 -08:00
irq.c RISC-V: Show IPI stats 2018-10-22 17:03:37 -07:00
Makefile Allow to disable FPU support 2018-10-22 17:02:23 -07:00
mcount-dyn.S riscv/ftrace: Add DYNAMIC_FTRACE_WITH_REGS support 2018-04-02 19:59:13 -07:00
mcount.S RISC-V: remove the unused return_to_handler export 2018-10-22 17:38:12 -07:00
module-sections.c RISC-V: Add section of GOT.PLT for kernel module 2018-04-02 20:00:54 -07:00
module.c RISC-V: Silence some module warnings on 32-bit 2018-11-12 18:12:24 -08:00
module.lds RISC-V: Add section of GOT.PLT for kernel module 2018-04-02 20:00:54 -07:00
perf_event.c RISC-V: Fix of_node_* refcount 2018-12-21 08:10:49 -08:00
process.c Auto-detect whether a FPU exists 2018-10-22 17:02:23 -07:00
ptrace.c RISC-V: Add FP register ptrace support for gdb. 2018-10-22 17:38:04 -07:00
reset.c
riscv_ksyms.c riscv: split the declaration of __copy_user 2018-06-09 12:34:31 -07:00
setup.c RISC-V: Remove EARLY_PRINTK support 2018-12-17 10:23:46 -08:00
signal.c Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
smp.c RISC-V: Show IPI stats 2018-10-22 17:03:37 -07:00
smpboot.c RISC-V: Fix of_node_* refcount 2018-12-21 08:10:49 -08:00
stacktrace.c riscv/ftrace: Add HAVE_FUNCTION_GRAPH_RET_ADDR_PTR support 2018-04-02 19:59:13 -07:00
sys_riscv.c RISC-V: Use a less ugly workaround for unused variable warnings 2018-08-28 12:58:36 -07:00
syscall_table.c RISC-V: Make __NR_riscv_flush_icache visible to userspace 2018-01-07 15:14:37 -08:00
time.c RISC-V: add of_node_put() 2018-12-21 08:11:08 -08:00
traps.c RISC-V: Don't increment sepc after breakpoint. 2018-08-13 08:31:30 -07:00
vdso.c riscv: remove redundant unlikely() 2018-01-30 19:12:06 -08:00
vmlinux.lds.S RISC-V: Make BSS section as the last section in vmlinux.lds.S 2019-01-07 07:59:25 -08:00