Kernel: Optimize boot time and add start/end messages

Signed-off-by: Gabriel Ionescu <gabriel.ionescu@enea.com>
Signed-off-by: Adrian Dudau <adrian.dudau@enea.com>

1 files changed, 95 insertions, 0 deletions

diff --git a/patches/kernel_startend_msg/0001-printk-add-Enea-Linux-boot-start-end-messages.patch b/patches/kernel_startend_msg/0001-printk-add-Enea-Linux-boot-start-end-messages.patch
new file mode 100644
index 0000000..0fa8756
--- /dev/null
+++ b/patches/kernel_startend_msg/0001-printk-add-Enea-Linux-boot-start-end-messages.patch
@@ -0,0 +1,95 @@
+From b91730ba705d151577974d5fb9f5371a4569b467 Mon Sep 17 00:00:00 2001
+From: Adrian Calianu <adrian.calianu@enea.com>
+Date: Tue, 6 Jun 2017 15:47:54 +0200
+Subject: [PATCH 1/1] printk: add Enea Linux boot start/end messages
+
+Signed-off-by: Adrian Calianu <adrian.calianu@enea.com>
+---
+ arch/x86/boot/compressed/misc.c | 23 ++++++++++++-----------
+ init/main.c                     |  4 +++-
+ 2 files changed, 15 insertions(+), 12 deletions(-)
+
+diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
+index b3c5a5f0..9fdf3c6 100644
+--- a/arch/x86/boot/compressed/misc.c
++++ b/arch/x86/boot/compressed/misc.c
+@@ -202,10 +202,10 @@ static void handle_relocations(void *output, unsigned long output_len,
+                delta = virt_addr - LOAD_PHYSICAL_ADDR;
+
+        if (!delta) {
+-               debug_putstr("No relocation needed... ");
++               /* debug_putstr("No relocation needed... "); */
+                return;
+        }
+-       debug_putstr("Performing relocations... ");
++       /* debug_putstr("Performing relocations... "); */
+
+        /*
+         * Process relocations: 32 bit relocations first then 64 bit after.
+@@ -286,7 +286,7 @@ static void parse_elf(void *output)
+                return;
+        }
+
+-       debug_putstr("Parsing ELF... ");
++       /* debug_putstr("Parsing ELF... ");*/
+
+        phdrs = malloc(sizeof(*phdrs) * ehdr.e_phnum);
+        if (!phdrs)
+@@ -360,17 +360,18 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
+        cols = boot_params->screen_info.orig_video_cols;
+
+        console_init();
+-       debug_putstr("early console in extract_kernel\n");
++       /* debug_putstr("early console in extract_kernel\n");*/
++       debug_putstr("\n");debug_putstr("Enea Linux kernel boot start\n");
+
+        free_mem_ptr     = heap;        /* Heap */
+        free_mem_end_ptr = heap + BOOT_HEAP_SIZE;
+
+        /* Report initial kernel position details. */
+-       debug_putaddr(input_data);
+-       debug_putaddr(input_len);
+-       debug_putaddr(output);
+-       debug_putaddr(output_len);
+-       debug_putaddr(kernel_total_size);
++       /*debug_putaddr(input_data);           */
++       /*debug_putaddr(input_len);             */
++       /*debug_putaddr(output);               */
++       /*debug_putaddr(output_len);         */
++       /*debug_putaddr(kernel_total_size);*/
+
+        /*
+         * The memory hole needed for the kernel is the larger of either
+@@ -401,11 +402,11 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
+                error("Destination virtual address changed when not relocatable");
+ #endif
+
+-       debug_putstr("\nDecompressing Linux... ");
++       /*debug_putstr("\nDecompressing Linux... ");*/
+        __decompress(input_data, input_len, NULL, NULL, output, output_len,
+                        NULL, error);
+        parse_elf(output);
+        handle_relocations(output, output_len, virt_addr);
+-       debug_putstr("done.\nBooting the kernel.\n");
++       /*debug_putstr("done.\nBooting the kernel.\n");*/
+        return output;
+ }
+diff --git a/init/main.c b/init/main.c
+index 8358cbe..613caa1 100644
+--- a/init/main.c
++++ b/init/main.c
+@@ -976,8 +976,10 @@ static int __ref kernel_init(void *unused)
+        if (!try_to_run_init_process("/sbin/init") ||
+            !try_to_run_init_process("/etc/init") ||
+            !try_to_run_init_process("/bin/init") ||
+-           !try_to_run_init_process("/bin/sh"))
++           !try_to_run_init_process("/bin/sh")) {
++               printk(KERN_EMERG "Enea Linux kernel boot end\n");
+                return 0;
++    }
+
+        panic("No working init found.  Try passing init= option to kernel. "
+              "See Linux Documentation/init.txt for guidance.");
+--
+2.7.4
+